Battery pack and electric apparatus

Abstract

Provided in the present application are a battery pack and an electric apparatus. The battery pack comprises: a housing defining an accommodating cavity; and an energy storage device arranged in the accommodating cavity, wherein the energy storage device comprises: a packaging film, a cell module and an encapsulation layer; the cell module comprises a plurality of solid-state cells arranged side by side in a first direction and electrically connected to each other, electrical connection parts of the plurality of solid-state cells being covered by means of the encapsulation layer; the packaging film wraps the cell module; and the cell module further has a first connection terminal and a second connection terminal which extend from the packaging film. In the battery pack of the present application, the electrical connection parts of the plurality of solid-state cells of the cell module are fixed by means of the encapsulation layer, then the entire cell module is packaged by the packaging film, such that the formed battery pack has only one packaging film. More solid-state cells can be accommodated in the battery pack, thereby improving the utilization rate of the internal space of the battery pack, and thus improving the energy density of the battery pack.

Description

Battery packs and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202411181215.8, filed on August 26, 2024, entitled "Battery Pack and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more particularly to a battery pack and electrical device. Background Technology

[0003] With the continuous advancement of modern technology and the increasing demand for portable electronic devices, battery technology is also constantly developing and innovating. Especially in consumer electronics, automobiles, and power tools, the need for batteries with high energy density, high safety, and long lifespan is particularly urgent. Pouch batteries, due to their advantages such as light weight, high energy density, and flexible shape, are gradually becoming the mainstream choice in the market.

[0004] Existing pouch batteries improve energy density by using multiple cells connected in series or parallel. Each cell is wrapped in an aluminum-plastic film and then packaged into a whole using a box. The aluminum-plastic film of each cell occupies a certain space, resulting in low utilization of the overall internal space of the pouch battery. Summary of the Invention

[0005] In view of the above problems, this application provides a battery pack and electrical device, which covers the electrical connection parts of multiple solid cells of the cell module with an encapsulation layer and uses a packaging film to package the entire cell module. In this way, the battery pack has only one packaging film, and more solid cells can be accommodated inside the battery pack, which improves the utilization rate of the internal space of the battery pack and thus improves the energy density of the battery pack.

[0006] This application provides a battery pack, including: a shell defining a receiving cavity; and an energy storage device disposed within the receiving cavity. The energy storage device includes: a packaging film, a cell module, and an encapsulation layer. The cell module includes a plurality of solid-state cells arranged side-by-side and electrically connected along a first direction. The electrical connection portions of the plurality of solid-state cells are covered by the encapsulation layer. The packaging film covers the cell module. The cell module further has a first connection terminal and a second connection terminal extending from the packaging film.

[0007] In the battery pack of this application, the electrical connection points of multiple solid-state cells in the cell module are fixed by an encapsulation layer. The entire cell module is packaged with a packaging film, and the resulting battery pack has only one packaging film. This avoids the problem of each cell being wrapped in an aluminum-plastic film, which would occupy space and lead to low utilization of the overall internal space of the battery pack. In this way, the space saved allows the battery pack to accommodate more solid-state cells, improving the utilization of the internal space of the battery pack and thus increasing the energy density of the battery pack.

[0008] In some embodiments, a plurality of the solid-state cells are connected in series and / or in parallel.

[0009] Furthermore, each of the solid-state cells includes two tabs with opposite polarities, the tabs being located at the end of the solid-state cell along a second direction, the encapsulation layer being located at the end of the solid-state cell along the second direction where the tabs are located, and encapsulating the tabs located at the same end of the plurality of solid-state cells, the second direction being perpendicular to the first direction.

[0010] According to some embodiments of this application, the two tabs of each solid-state battery cell are respectively located at both ends of the solid-state battery cell along the second direction, and there are two encapsulation layers, which are respectively located at both ends of the battery cell module along the second direction, so as to encapsulate the tabs located at both ends of the battery cell module.

[0011] According to some embodiments of this application, it further includes: a connector for connecting the tabs of a plurality of solid-state cells in series and / or in parallel, and the encapsulation layer further encapsulates the connector.

[0012] According to some embodiments of this application, the two tabs include a first tab and a second tab. Each solid-state battery cell includes a first electrode, an electrolyte layer, and a second electrode arranged in layers along the first direction. The first electrode has the first tab, and the second electrode has the second tab. The plurality of solid-state batteries arranged along the first direction include a head battery cell and a tail battery cell. The first tab of one of the head battery cell and the tail battery cell extends from the packaging film and forms the first connection terminal, and the second tab of the other extends from the packaging film and forms the second connection terminal.

[0013] According to some embodiments of this application, the packaging film is provided with a first through hole corresponding to the first connecting terminal and a second through hole corresponding to the second connecting terminal. The first connecting terminal passes through the first through hole and is sealed to the packaging film; the second connecting terminal passes through the second through hole and is sealed to the packaging film.

[0014] According to some embodiments of this application, the packaging film is an aluminum-plastic film, the aluminum-plastic film includes a hot-melt layer, and a connecting adhesive is provided on a portion of the surface of the first connecting terminal and the second connecting terminal, the hot-melt layer and the connecting adhesive are hot-melted together.

[0015] According to some embodiments of this application, the inner cavity of the packaging film is in a vacuum state.

[0016] According to some embodiments of this application, the energy storage device further includes a diaphragm, wherein two adjacent solid-state cells are separated by the diaphragm.

[0017] According to some embodiments of this application, the housing includes:

[0018] A tray defining the receiving cavity with an opening at one end; a cover sealing the opening of the tray.

[0019] According to some embodiments of this application, the cover is made of waterproof and wear-resistant fabric.

[0020] According to some embodiments of this application, the cover includes:

[0021] A substrate layer, which is a flexible component; and a composite layer, which is disposed on the surface of the substrate layer.

[0022] According to some embodiments of this application, the substrate layer includes a nylon layer.

[0023] According to some embodiments of this application, the composite layer is at least one of a silicon layer and a rubber layer.

[0024] According to some embodiments of this application, the housing includes:

[0025] A sealant is used to seal the periphery of the cover to the open end face of the tray.

[0026] This application also provides an electrical device, including: the battery pack described above.

[0027] The electrical equipment of this application, due to the use of the aforementioned battery pack, has a higher energy density within the same volume, resulting in a longer battery life. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 is an exploded structural diagram of the battery pack according to an embodiment of this application;

[0030] Figure 2 is a schematic diagram of the energy storage device according to an embodiment of this application;

[0031] Figure 3 is a partial structural schematic diagram of the battery cell module according to an embodiment of this application;

[0032] Figure 4 is a schematic diagram of the structure of a solid-state battery cell according to an embodiment of this application;

[0033] Figure 5 is a schematic diagram of the battery cell module of this application having one end covered by the encapsulation layer along the second direction;

[0034] Figure 6 is a schematic diagram of multiple solid-state battery cells connected in parallel to form a battery cell module according to an embodiment of this application;

[0035] Figure 7 is an enlarged structural diagram of point A in Figure 6;

[0036] Figure 8 is a schematic diagram of a battery cell module formed by connecting multiple solid-state battery cells in series according to an embodiment of this application;

[0037] Figure 9 is an enlarged structural diagram of point B in Figure 8;

[0038] Figure 10 is a schematic diagram of the structure of the first perforation on the packaging film according to an embodiment of this application.

[0039] Explanation of reference numerals in the attached drawings: 100-Battery pack; 110-Outer casing; 111-Tray; 112-Cover; 113-Sealant; 120-Energy storage device; 121-Packaging film; 1211-First perforation; 122-Cell module; 1221-Solid-state cell; 1221a-First electrode; 1221b-Second electrode; 1221c-Electrolyte layer; 1221d-First cell; 1221e-End cell; 1222-Taper; 1222a-First tab; 1222b-Second tab; 123-Encapsulation layer; 124-First connection terminal; 125-Second connection terminal; 126-Connector; 127-Separator. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] Soft-pack batteries improve energy density by using multiple cells connected in series or parallel. Each cell is wrapped in an aluminum-plastic film and packaged into a whole in a box. The aluminum-plastic film of each cell occupies a certain space, resulting in low utilization of the overall internal space of the soft-pack battery.

[0042] In view of this, embodiments of this application provide a battery pack and an electrical device. By covering multiple solid-state cells of a cell module with an encapsulation layer, and then packaging the entire cell module with a packaging film, the resulting battery pack consists of only one packaging film. This allows the battery pack to accommodate more solid-state cells, improving the utilization rate of the internal space and thus increasing the energy density of the battery pack.

[0043] For ease of description, the length direction of the battery pack can be a first direction, such as the X direction shown in Figure 3; the width direction of the battery pack can be a second direction, such as the Y direction shown in Figure 3, and the X direction and the Y direction are perpendicular to each other.

[0044] The battery pack 100 provided in the embodiments of this application will now be described with reference to Figures 1 to 10.

[0045] Referring to Figures 1 to 3, the battery pack 100 may include a housing 110 and an energy storage device 120.

[0046] The outer casing 110 is the main supporting structure of the battery pack 100. The outer casing 110 defines the receiving cavity. The energy storage device 120 is disposed inside the outer casing 110. The outer casing 110 prevents water, dust and other impurities from entering the receiving cavity, ensuring the normal use of the battery pack 100.

[0047] An energy storage device 120 is disposed within a receiving cavity and stores electrical energy for powering electrical equipment. The energy storage device 120 may include a packaging film 121, a battery cell module 122, and an encapsulation layer 123. The battery cell module 122 includes multiple solid-state batteries 1221, which are arranged side-by-side and electrically connected along a first direction (X direction in Figure 3). It should be noted that the solid-state batteries 1221 refer to batteries with a solid electrolyte. The electrical connection points (tabs 1222 described later) of the multiple solid-state batteries 1221 are covered by the encapsulation layer 123, fixing the relative positions of the multiple solid-state batteries 1221. The packaging film 121 covers the battery cell module 122, thereby forming an integrated energy storage device 120. The battery cell module 122 also has a first connection terminal 124 and a second connection terminal 125 extending from the packaging film 121. The battery pack 100 is electrically connected to the positive and negative terminals of the electrical equipment via the first connection terminal 124 and the second connection terminal 125, respectively, to supply power to the electrical equipment.

[0048] The battery pack 100 of this application covers the electrical connection points of multiple solid-state cells 1221 of the cell module 122 with an encapsulation layer 123, thereby fixing the solid-state cells 1221 relatively. The entire cell module 122 is packaged with a packaging film 121 to form an integrated energy storage device 120. Compared with the structure in related technologies where each cell is wrapped with an aluminum-plastic film, the number of packaging films 121 required inside the cell module 122 is greatly reduced because the size of the outer shell 110 remains unchanged. This reduces the volume of the cell module 122, allowing the battery pack 100 to accommodate more solid-state cells 1221, improving the utilization rate of the internal space of the battery pack 100, and thus increasing the energy density of the battery pack 100.

[0049] In some embodiments, referring to Figures 4, 7, and 9, each solid-state battery cell 1221 includes a first electrode 1221a, an electrolyte layer 1221c, a second electrode 1221b, and two tabs 1222 with opposite polarities. The first electrode 1221a, electrolyte layer 1221c, and second electrode 1221b are stacked along a first direction. The two tabs 1222 are the first tab 1222a and the second tab 1222b, respectively, and are located at the ends of the solid-state battery cell 1221 along a second direction (the Y direction shown in Figure 3). The first tab 1222a and the second tab 1222b may be located at the same end of the solid-state battery cell 1221 along the second direction, or they may be located at opposite ends of the solid-state battery cell 1221 along the second direction.

[0050] A first tab 1222a is disposed on a first electrode 1221a, and a second tab 1222b is disposed on a second electrode 1221b. The first electrode 1221a can be a positive electrode, and the first tab 1222a can be a positive tab 1222. The first electrode 1221a includes a first current collector, the material of which can include lithium cobalt oxide (LiCoO2), lithium nickel manganese cobalt oxide (NMC), lithium iron phosphate (LFP), etc., and a positive active layer is coated on the first current collector.

[0051] The second electrode 1221b can be a negative electrode, and the second tab 1222b can be a negative tab 1222. The second electrode 1221b includes a second current collector, the material of which can include activated carbon or graphene, and a negative electrode active layer is coated on the second current collector.

[0052] The electrolyte layer 1221c can be an inorganic solid electrolyte layer, an organic solid electrolyte layer, or a composite solid electrolyte layer. During the charging and discharging process of the battery pack 100, the electrolyte layer 1221c conducts lithium ions (or other conductive ions) to move between the first electrode 1221a and the second electrode 1221b, thus playing a conductive role.

[0053] The plurality of solid-state cells 1221 arranged along the first direction include a first-end cell 1221d and a last-end cell 1221e. Other solid-state cells 1221 may be present between the first-end cell 1221d and the last-end cell 1221e. For example, one or more intermediate solid-state cells 1221 may be present between the first-end cell 1221d and the last-end cell 1221e. The first-end cell 1221d is electrically connected to the last-end cell 1221e through the intermediate solid-state cells 1221.

[0054] In one of the first-end cell 1221d and the last-end cell 1221e, the first tab 1222a extends from the packaging film 121 and forms the first connection terminal 124, and the second tab 1222b of the other extends from the packaging film 121 and forms the second connection terminal 125. For example, the first tab 1222a of the first-end cell 1221d extends from the packaging film 121 to form the first connection terminal 124, in which case the first connection terminal 124 is the positive terminal, and the second tab 1222b of the last-end cell 1221e extends from the packaging film 121 to form the second connection terminal 125, in which case the second connection terminal 125 is the negative terminal; or, the first tab 1222a of the last-end cell 1221e extends from the packaging film 121 to form the first connection terminal 124, and the second tab 1222b of the first-end cell 1221d extends from the packaging film 121 to form the second connection terminal 125.

[0055] By stacking multiple solid-state cells 1221 along a first direction, and making the tabs 1222 of the first cell 1221d and the last cell 1221e form the first connection terminal 124 and the second connection terminal 125 respectively, the internal connection structure of the battery pack 100 is simplified, the number of welding points and connection lines between solid-state cells 1221 is reduced, the manufacturing complexity and cost of the battery pack 100 are reduced, thereby making the assembly of the battery pack 100 more efficient, reducing production time and labor costs, and improving production efficiency.

[0056] In some embodiments, referring to FIG3, the energy storage device 120 may further include a separator 127, which separates two adjacent solid-state cells 1221. The separator 127 may be a polymer separator, an inorganic separator (such as polyethylene terephthalate or polypropylene), or a composite separator. The separator 127 has insulating properties and can achieve electrical isolation between adjacent solid-state cells 1221, thereby avoiding short circuits between adjacent solid-state cells 1221 and improving the safety of the battery pack 100.

[0057] In one possible implementation, the projection of the solid-state cell 121 onto the reference plane (the YZ plane shown in Figure 3) lies within the projection of the separator 127 onto the reference plane. For example, the orthographic projection of the solid-state cell 121 onto the reference plane completely coincides with the orthographic projection of the separator 127 onto the reference plane; or, the outer contour of the orthographic projection of the solid-state cell 121 onto the reference plane lies inside the outer contour of the orthographic projection of the separator 127 onto the reference plane. This ensures that the separator 127 can completely separate two adjacent solid-state cells 121.

[0058] In some embodiments, referring to Figures 6 and 7, the multiple solid-state cells 1221 can be connected in parallel, with adjacent solid-state cells 1221 having the same polarity of tabs 1222 connected sequentially. In other words, the multiple solid-state cells 1221 are arranged along a first direction, and adjacent tabs 1222 along the first direction have the same polarity. In this case, the first tabs 1222a are all connected to the first tabs 1222a, and the second tabs 1222b are all connected to the second tabs 1222b. Thus, the capacity of each solid-state cell 121 is added together, which can increase the total capacity of the energy storage device 120 to meet the long-term power supply needs of electrical equipment.

[0059] Alternatively, referring to Figures 8 and 9, the multiple solid-state cells 1221 can also be connected in series, with the tabs 1222 of two adjacent solid-state cells 1221 of opposite polarity connected in sequence. In other words, the multiple solid-state cells 1221 are arranged along the first direction, and the two adjacent tabs 1222 along the first direction have opposite polarities. At this time, the first tab 1222a is connected to the second tab 1222b. In this way, the multiple solid-state cells 1221 are connected in series, which can increase the total voltage of the energy storage device 120 and meet the high voltage application requirements of electrical equipment.

[0060] In addition to the methods described above, multiple solid-state cells 1221 can also be connected in series and in parallel. Of course, this application is not limited to this; the connection method between multiple solid-state cells 1221 can be reasonably selected according to actual needs to meet energy storage and supply requirements.

[0061] According to some embodiments of this application, referring to FIG5, the energy storage device 120 may further include a connector 126. The connector 126 may be a metallic material, such as copper, aluminum, or nickel, or a composite material, such as copper-aluminum composite material, or a plating material, such as nickel-plated copper strip or silver-plated copper strip, and has good conductivity. During the series or parallel connection of multiple solid-state cells 1221, the connector 126 extends along a first direction to connect the tabs 1222 of the multiple solid-state cells 1221, thereby forming a complete current path. Furthermore, the connector 126 also provides solid support for the tabs 1222, improving the reliability of the connection between the solid-state cells 1221.

[0062] Understandably, when multiple solid-state cells 1221 of the cell module 122 are connected in parallel, the connector 126 can be a long strip of metal, and the first tab 1222a and the second tab 1222b of the solid-state cell 1221 can be connected to the connector 126 respectively. Referring to Figure 3, when multiple solid-state cells 1221 of the cell module 122 are connected in series, the connector 126 can be multiple metal sheets. The two adjacent tabs 1222 are sequentially welded to both ends of the metal sheets along the first direction. For example, along the first direction, the first tab 1222a of the first cell 1221d forms the first connection terminal 124, the second tab 1222b of the first cell 1221d is connected to the first tab of the second solid-state cell through the connector 126, the second tab of the second solid-state cell is connected to the first tab of the third solid-state cell through the connector 126, until the first tab of the last cell 1221e is connected to the second tab of the previous solid-state cell through the connector 126, and the second tab of the last cell 1221e forms the second connection terminal 125.

[0063] In this way, a complete series current loop is formed, thereby increasing the total voltage of the energy storage device 120. Of course, when multiple solid-state cells 1221 of the cell module 122 are connected in series, the connector 126 can also be a strip. Multiple conductive areas are spaced apart on the connector 126, and the other areas on the strip are insulating areas. The number of conductive areas corresponds to the number of solid-state cells 1221. The first tab 1222a and the second tab 1222b of two adjacent solid-state cells 1221 are connected to the conductive areas respectively. In this way, short circuits between solid-state cells 1221 are avoided, which helps to improve the safety of the battery pack 100.

[0064] According to some embodiments of this application, continuing to refer to FIG5, the encapsulation layer 123 can be a potting compound formed by potting the tabs 1222 of a plurality of solid-state cells 1221. The encapsulation layer 123 can be located at one end of the solid-state cell 1221 along the second direction where the tabs 1222 are provided, and encapsulates the tabs 1222 located at the same end of the plurality of solid-state cells 1221. When two tabs 1222 of the solid-state cell 121 are located at the same end of the solid-state cell 121, the encapsulation layer 123 is located at one end of the solid-state cell 1221 along the second direction where the tabs 1222 are provided, and encapsulates the first tab 1222a and the second tab 1222b along the first direction.

[0065] When the two tabs 1222 of the solid-state battery cell 121 are located at both ends of the solid-state battery cell 121 along the second direction, taking the first end cell 1221d as an example, the encapsulation layer 123 can be located on the side of the first end cell 1221d with the first tab 1222a, and encapsulated along the first direction to encapsulate and fix the connector 126 and all the tabs 1222 connected to the connector 126; or, the encapsulation layer 123 can also be located on the side of the first end cell 1221d with the second tab 1222b, and encapsulated along the first direction to encapsulate and fix the connector 126 and all the tabs 1222 connected to the connector 126.

[0066] The encapsulation layer 123 effectively covers and isolates the tabs 1222, preventing them from corroding due to contact with air. It also prevents contact between the tabs 1222, thus avoiding short circuits and improving the safety of the battery pack 100. Furthermore, the encapsulation layer 123 enhances the fixation of the tabs 1222, thereby improving the fixation of the multiple solid-state cells 1221. Additionally, it prevents the tabs 1222 from shifting or breaking under vibration or impact conditions, thus enhancing the mechanical stability of the battery pack 100.

[0067] According to some embodiments of this application, the two tabs 1222 of the solid-state cell 121 are respectively located at both ends of the solid-state cell 121 along the second direction. There can be two encapsulation layers 123, each located at one end of the cell module 122 along the second direction, to respectively encapsulate the tabs 1222 and the connectors 126 located at both ends of the cell module 122. This further improves the fixing effect on the multiple solid-state cells 1221 of the cell module 122. Furthermore, the two encapsulation layers 123, located at both ends of the cell module 122 along the second direction, can seal the cell module 122, preventing impurities from entering the cell module 122, thereby improving the safety of the battery pack 100.

[0068] In some embodiments, referring to Figures 2 and 10, the packaging film 121 is provided with a first through hole 1211 corresponding to the first connecting terminal 124 and a second through hole (not shown in the figures) corresponding to the second connecting terminal 125. The first connecting terminal 124 passes through the first through hole 1211 and is sealed to the packaging film 121; the second connecting terminal 125 passes through the second through hole and is sealed to the packaging film 121.

[0069] The first connection terminal 124 of the cell module 122 protrudes from the first through hole 1211, and the second connection terminal 125 protrudes from the second through hole. Both the first and second connection terminals 124 and 125 are sealed to the packaging film 121. The resulting energy storage device 120 is connected to a charging device or a power-consuming device via the first and second connection terminals 124 and 125 respectively for charging and discharging. This design ensures good sealing performance of the energy storage device 120, preventing moisture, dust, and other debris from entering the battery pack 100 through the first or second through hole 1211, contaminating the solid-state cell 1221, reducing the performance of the battery pack 100, or even damaging it, thus extending the lifespan of the battery pack 100.

[0070] According to some embodiments of this application, the packaging film 121 can be an aluminum-plastic film. From the outside to the inside, the aluminum-plastic film can include an outer film layer, an intermediate layer, and a heat-sealing layer. The heat-sealing layer faces the energy storage device 120. The outer film layer can be an organic material layer (such as polyethylene terephthalate), providing physical support strength and wear resistance for the energy storage device 120. The intermediate layer is an aluminum foil layer, mainly serving to block air and moisture, ensuring the battery's interior is isolated from the external environment, and providing the energy storage device 120 with certain mechanical strength and thermal stability. The heat-sealing layer can be polypropylene or other heat-sealing materials. Heating with heat-sealing equipment melts the heat-sealing layer, achieving a seal for the energy storage device 120, providing good sealing performance and preventing external contamination of the energy storage device 120's interior.

[0071] Each of the first connecting terminal 124 and the second connecting terminal 125 has a portion of its surface covered with adhesive. The process of sealing the energy storage device 120 can be as follows: the battery cell module 122 is encapsulated within a packaging film 121; the first connecting terminal 124 protrudes from the first through-hole 1211; and the second connecting terminal 125 protrudes from the second through-hole. A heat-sealing device heats the first and second through-holes, melting the heat-melting layer at the first and second through-holes of the packaging film 121, as well as the adhesive on the first and second connecting terminals 124 and 125, thus achieving a heat-melt bond between the heat-melting layer and the adhesive. This provides a good seal for the energy storage device 120, preventing external impurities from entering the device and extending its service life.

[0072] Understandably, the adhesive on the surfaces of the first connecting terminal 124 and the second connecting terminal 125 is disposed at the end of the first connecting terminal 124 and the second connecting terminal 125 that are respectively connected to the cell module 122, that is, the part located inside the packaging film 121. In this way, while ensuring the sealing effect of the energy storage device 120, there are no spots formed by molten adhesive on the surface of the energy storage device 120, the external flatness of the energy storage device 120 is high, the stress uniformity of the battery pack 100 is improved, and the service life of the battery pack 100 is extended.

[0073] According to some embodiments of this application, the processing of the energy storage device 120 in this embodiment may involve first connecting multiple solid-state battery cells 1221 in series or parallel to form a battery cell module 122, then covering the battery cell module 122 with a packaging film 121, and then injecting an encapsulation layer 123 into both ends of the battery cell module 122 along the second direction to fix the two tabs 1222 at both ends of each solid-state battery cell 1221. The first connection terminal 124 and the second connection terminal 125 are respectively heat-sealed to the packaging film 121, and finally the packaging film 121 is heat-sealed and vacuumed simultaneously to make the inner cavity of the packaging film 121 a vacuum state. Thus, the vacuuming process removes air and moisture from inside the energy storage device 120, preventing oxygen and moisture in the air from reacting with the electrolyte layer 1221c of the solid-state battery cell 1221, thereby reducing the performance of the battery pack 100 and extending its service life. Furthermore, the vacuuming process within the packaging film 121 improves the uniformity of the encapsulation layer 123 within the energy storage device 120, thereby enhancing the fixation effect on the battery cell module 122 and its supporting role in the energy storage device 120. In addition, the encapsulation layer 123 also prevents the negative pressure created by the vacuuming process from compressing the tabs 1222, causing deformation and short circuits due to contact between tabs of different polarities.

[0074] According to some embodiments of this application, referring to FIG1, the outer casing 110 may include a tray 111 and a cover 112. The tray 111 defines a receiving cavity with an opening at one end (the top end as shown in FIG1). The energy storage device 120 is disposed in the receiving cavity. The receiving cavity may be coated with an insulating adhesive coating, which serves to provide insulation and improve the safety of battery use, and also improves the sealing effect inside the outer casing 110 to prevent external dirt from entering the battery pack 100. The cover 112 seals the opening of the tray 111. In this way, a complete battery pack 100 is formed, preventing external impurities from entering the battery pack 100, thereby improving the support and protection of the energy storage device 120 and improving the sealing performance of the battery pack 100. This allows the battery pack 100 to still be used normally under harsh external environmental conditions, improving the environmental adaptability of the battery pack 100.

[0075] Furthermore, the cover 112 can be made of waterproof and wear-resistant fabric, which enhances the wear resistance of the outer shell 110 while ensuring the sealing effect of the outer shell 110. Compared with the metal or plastic cover 112 of the existing soft-pack battery, the cover 112 of this embodiment is made of lighter material, which is conducive to adapting to the development trend of lightweight battery pack 100 and electrical equipment. In addition, the cover 112 of the existing soft-pack battery cell is assembled with snap fasteners or threaded compression and sealed with the box body, which has high processing requirements. The cover 112 of this embodiment can be fixed by adhesive, which is convenient to process and helps to reduce processing costs.

[0076] Furthermore, the cover 112 may include a base layer and a composite layer. The base layer is a flexible component, allowing the cover 112 to adapt to various shape changes, providing better sealing and adaptability. The lightweight nature of the flexible component makes the battery pack 100 lighter. The composite layer can be made of a high-strength material and is compositely disposed on the surface of the base layer, which can significantly enhance the strength and durability of the cover 112.

[0077] Specifically, the base layer may include a nylon layer, which possesses excellent tensile strength and abrasion resistance. Using a nylon layer as the base layer can improve the mechanical properties of the cover 112, making it more durable and able to withstand greater mechanical stress and wear. Furthermore, nylon has high heat resistance, maintaining its physical properties at high temperatures, allowing the battery pack 100 to be used in high-temperature environments. In addition, while maintaining high strength, nylon material still possesses a certain degree of flexibility, allowing the cover 112 to adapt to various shapes and surface variations, thereby providing a good sealing effect for the battery pack 100.

[0078] Specifically, the composite layer is at least one of a silicon layer and a rubber layer. For example, the composite layer can be a silicon layer. Silicon material has extremely high heat resistance and can maintain its physical and chemical properties in high-temperature environments. Using a silicon layer as the composite layer allows the cover 112 to perform excellently in high-temperature applications, thereby improving the performance of the battery pack 100 in high-temperature environments. Silicon material also has excellent electrical insulation properties, effectively preventing electrical short circuits and other electrical problems, thus protecting the energy storage device 120 inside the casing 110; silicon material also has excellent waterproof properties, effectively preventing water penetration, so that the cover 112 provides reliable protection for the battery pack 100 when used in humid or underwater environments.

[0079] Alternatively, the composite layer can be a rubber layer. Rubber materials have excellent elasticity and flexibility, enabling them to adapt to various shapes and surface changes. In this way, the cover 112 can provide a good sealing effect for the battery pack 100. Rubber materials also have good shock absorption and cushioning properties, effectively absorbing and dispersing external impacts and vibrations, thus improving the protection of the energy storage device 120 inside the battery pack 100. Alternatively, the composite layer can also include both a silicon layer and a rubber layer, allowing the composite layer to combine the advantages of both materials. This not only improves the protection of the energy storage device 120 inside the battery pack 100 but also makes the battery pack 100 suitable for various complex and harsh operating environments (such as high temperature and humid environments).

[0080] According to some embodiments of this application, the outer casing 110 may further include a sealant 113, and the periphery of the cover 112 is sealed to the open end face of the tray 111 by the sealant 113. Filling the gap between the cover 112 and the open end face of the tray 111 with the sealant 113 provides an excellent sealing effect, preventing air, moisture, dust, and other contaminants from entering the receiving cavity of the tray 111, thus ensuring the stability and safety of the internal environment of the battery pack 100.

[0081] Secondly, embodiments of this application provide an electrical device, which can be an electric vehicle. The electric vehicle can be a pure electric vehicle (PEV / BEV), a range-extended electric vehicle (REEV), a hybrid electric vehicle (HEV), or a fuel cell electric vehicle. It can also be any vehicle equipped with a battery. In addition, the electrical device can also be a communication base station, an energy storage container, an energy storage cabinet, or other electrical equipment.

[0082] Specifically, the electrical equipment may include the battery pack 100 mentioned above. The electrical equipment is provided with a battery compartment, and the battery pack 100 is disposed in the battery compartment. The first connection terminal 124 and the second connection terminal 125 of the battery pack 100 are respectively connected to the two ends of the circuit of the electrical equipment.

[0083] Because of the use of the battery pack 100 described above, the energy density of the battery pack 100 in this embodiment is high within the same volume, resulting in a longer battery life for the electrical equipment.

[0084] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0085] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0086] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack (100), wherein, include: The outer shell (110) defines the receiving cavity; An energy storage device (120) is disposed within the receiving cavity. The energy storage device (120) includes: a packaging film (121), a battery cell module (122), and an encapsulation layer (123). The battery cell module (122) includes a plurality of solid-state batteries (1221) arranged side by side and electrically connected along a first direction. The electrical connection portions of the plurality of solid-state batteries (1221) are covered by the encapsulation layer (123). The packaging film (121) covers the battery cell module (122). The battery cell module (122) also has a first connection terminal (124) and a second connection terminal (125) extending from the packaging film (121).

2. The battery pack (100) according to claim 1, wherein, Multiple solid-state cells (1221) are connected in series and / or in parallel.

3. The battery pack (100) according to claim 2, wherein, Each of the solid-state cells (1221) includes two tabs (1222) of opposite polarity, the tabs (1222) being located at the ends of the solid-state cell (1221) along a second direction. The encapsulation layer (123) is located at one end of the solid-state cell (1221) along the second direction where the tab (1222) is provided, and encapsulates the tabs (1222) located at the same end of the plurality of solid-state cells (1221). The second direction is perpendicular to the first direction.

4. The battery pack (100) according to claim 3, wherein, The two tabs (1222) of each solid-state battery cell (1221) are respectively located at both ends of the solid-state battery cell (1221) along the second direction. There are two encapsulation layers (123), which are located at both ends of the battery cell module (122) along the second direction, respectively, to encapsulate the tabs (1222) located at both ends of the battery cell module (122).

5. The battery pack (100) according to claim 3 or 4, wherein, It also includes: a connector (126) that connects the tabs (1222) of a plurality of solid-state cells (1221) in series and / or in parallel, and the encapsulation layer (123) further encapsulates the connector (126).

6. The battery pack (100) according to any one of claims 3-5, wherein, The two electrodes (1222) include a first electrode (1222a) and a second electrode (1222b). Each of the solid-state battery cells (1221) includes a first electrode (1221a), an electrolyte layer (1221c), and a second electrode (1221b) stacked along the first direction. The first electrode (1221a) is provided with a first tab (1222a), and the second electrode (1221b) is provided with a second tab (1222b). The plurality of solid-state battery cells (1221) arranged along the first direction include a first-end cell and a second-end cell. The first tab (1222a) of one of the first-end battery cell and the last-end battery cell extends from the packaging film (121) and forms the first connection terminal (124), while the second tab (1222b) of the other extends from the packaging film (121) and forms the second connection terminal (125).

7. The battery pack (100) according to any one of claims 1-6, wherein, The packaging film (121) is provided with a first through hole (1211) corresponding to the first connecting terminal (124) and a second through hole corresponding to the second connecting terminal (125). The first connecting terminal (124) passes through the first through hole (1211) and is sealed to the packaging film (121); The second connecting terminal (125) passes through the second perforation and is sealed to the packaging film (121).

8. The battery pack (100) according to claim 7, wherein, The packaging film (121) is an aluminum-plastic film, which includes a hot-melt layer. The first connecting terminal (124) and the second connecting terminal (125) are respectively provided with a connecting adhesive on a portion of their surfaces. The hot-melt layer and the connecting adhesive are hot-melted together.

9. The battery pack (100) according to any one of claims 1-8, wherein, The inner cavity of the packaging film (121) is in a vacuum state.

10. The battery pack (100) according to any one of claims 1-9, wherein, The energy storage device (120) further includes a diaphragm (127) that separates two adjacent solid-state cells (1221).

11. The battery pack (100) according to any one of claims 1-10, wherein, The outer casing (110) includes: A tray (111) defines the receiving cavity that is open at one end; A cover (112) that covers the opening of the tray (111).

12. The battery pack (100) according to claim 11, wherein, The cover (112) is made of waterproof and wear-resistant fabric.

13. The battery pack (100) according to claim 12, wherein, The cover (112) includes: A substrate layer, wherein the substrate layer is a flexible component; A composite layer is disposed on the surface of the substrate layer.

14. The battery pack (100) according to claim 13, wherein, The matrix layer includes a nylon layer.

15. The battery pack (100) according to claim 13 or 14, wherein, The composite layer is at least one of a silicon layer and a rubber layer.

16. The battery pack (100) according to any one of claims 12-15, wherein, The outer casing (110) includes: A sealant (113) is used to seal the periphery of the cover (112) to the open end face of the tray (111).

17. An electrical appliance, wherein, include: The battery pack (100) according to any one of claims 1-16.

Images